/*
 * Copyright (c) 2013, 2021, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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package org.graalvm.compiler.truffle.runtime;

public final class FixedPointMath {
    private static final int SCALE = 4;

    /**
     * should not be instantiated.
     */
    private FixedPointMath() {
        throw new IllegalStateException("Should not instantiate" + this.getClass().getName());
    }

    public static int toFixedPoint(double x) {
        return (int) (x * (1 << SCALE));
    }

    public static int multiply(int fixedPointValue, int anInteger) {
        return (fixedPointValue * anInteger) >> SCALE;
    }

    public static double toDouble(int fixedPointValue) {
        return ((double) fixedPointValue) / (1 << SCALE);
    }
}
